2017MNRAS.471.2321D


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.09CEST05:30:50

2017MNRAS.471.2321D - Mon. Not. R. Astron. Soc., 471, 2321-2333 (2017/October-3)

A remarkably large depleted core in the Abell 2029 BCG IC 1101.

DULLO B.T., GRAHAM A.W. and KNAPEN J.H.

Abstract (from CDS):

We report the discovery of an extremely large (Rb ∼2.77 arcsec ≃ 4.2 kpc) core in the brightest cluster galaxy, IC 1101, of the rich galaxy cluster Abell 2029. Luminous core-Sersic galaxies contain depleted cores - with sizes (Rb) typically 20-500 pc - that are thought to be formed by coalescing black hole binaries. We fit a (double nucleus) + (spheroid) + (intermediate-scale component) + (stellar halo) model to the Hubble Space Telescope surface brightness profile of IC 1101, finding the largest core size measured in any galaxy to date. This core is an order of magnitude larger than those typically measured for core-Sersic galaxies. We find that the spheroid's V-band absolute magnitude (MV) of -23.8 mag (∼25 per cent of the total galaxy light, i.e. including the stellar halo) is faint for the large Rb, such that the observed core is 1.02 dex ≃ 3.4σs (rms scatter) larger than that estimated from the Rb-MV relation. The suspected scouring process has produced a large stellar mass deficit (Mdef) ∼4.9 x 1011 M, i.e. a luminosity deficit ≃28 per cent of the spheroid's luminosity prior to the depletion. Using IC 1101's black hole mass (MBH) estimated from the MBH-σ, MBH-L and MBH-M* relations, we measure an excessive and unrealistically high number of 'dry' major mergers for IC 1101 (i.e. N 76) as traced by the large Mdef/MBH ratios of 38-101. The large core, high mass deficit and oversized Mdef/MBH ratio of IC 1101 suggest that the depleted core was scoured by overmassive SMBH binaries with a final coalesced mass MBH ∼ (4-10) x 1010 M, i.e. ∼ (1.7-3.2) x σs larger than the black hole masses estimated using the spheroid's σ, L and M*. The large core might be partly due to oscillatory core passages by a gravitational radiation-recoiled black hole.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: nuclei - galaxies: photometry - galaxies: structure - galaxies: structure

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 812 0
2 ACO 154 ClG 01 10 58.1 +17 39 56           ~ 139 1
3 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 340 0
4 NGC 3842 BiC 11 44 02.155 +19 56 59.37 14.22 13.70 11.82 12.04   ~ 259 3
5 UGCA 275 G 12 14 59.677 +09 33 54.51   18       ~ 25 1
6 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 389 0
7 NGC 4889 BiC 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 659 1
8 NGC 5419 BiC 14 03 38.771 -33 58 42.20   11.77 11.33 10.21   ~ 175 2
9 IC 1101 rG 15 10 56.100 +05 44 41.19   15.10       ~ 148 2
10 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 879 0
11 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1120 1
12 3C 338.0 QSO 16 28 38.2447110 +39 33 04.233634   12.78 11.78     ~ 716 5
13 ACO 2261 ClG 17 22 28.3 +32 09 13           ~ 301 0

    Equat.    Gal    SGal    Ecl

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2021.05.09-05:30:50

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